SE9800338L - Methods and apparatus for audio coding - Google Patents
Methods and apparatus for audio codingInfo
- Publication number
- SE9800338L SE9800338L SE9800338A SE9800338A SE9800338L SE 9800338 L SE9800338 L SE 9800338L SE 9800338 A SE9800338 A SE 9800338A SE 9800338 A SE9800338 A SE 9800338A SE 9800338 L SE9800338 L SE 9800338L
- Authority
- SE
- Sweden
- Prior art keywords
- coefficients
- spectral
- values
- updated
- predicted
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/02—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
- G10L19/0212—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders using orthogonal transformation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/06—Determination or coding of the spectral characteristics, e.g. of the short-term prediction coefficients
Abstract
Consecutive frames of an audio signal are transformed into the frequency domain using a modified discrete cosine transform (MDCT) so as to generate a stream of spectral data values for each spectral component. A set of linear prediction coefficients are calculated for each spectral value and are based on a predetermined number of previously determined reconstructed values. The coefficients are recalculated only after receiving several spectral values and thus the same coefficients are used for several consecutive predictions before being updated. A predicted spectral value is generated using the coefficients and the error between the predicted and actual spectral values is calculated. The rate at which the coefficients are updated may be variable. A decoder for receiving and decoding the error values is also disclosed. Application is to a mobile phone system.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI970553A FI970553A (en) | 1997-02-07 | 1997-02-07 | Audio coding method and device |
Publications (2)
Publication Number | Publication Date |
---|---|
SE9800338D0 SE9800338D0 (en) | 1998-02-05 |
SE9800338L true SE9800338L (en) | 1998-08-08 |
Family
ID=8548146
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE9800338A SE9800338L (en) | 1997-02-07 | 1998-02-05 | Methods and apparatus for audio coding |
Country Status (9)
Country | Link |
---|---|
JP (1) | JPH10260699A (en) |
CN (1) | CN1202513C (en) |
AU (1) | AU5664898A (en) |
DE (1) | DE19804584A1 (en) |
FI (1) | FI970553A (en) |
FR (1) | FR2759510A1 (en) |
GB (1) | GB2322776B (en) |
SE (1) | SE9800338L (en) |
WO (1) | WO1998035447A2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8332216B2 (en) * | 2006-01-12 | 2012-12-11 | Stmicroelectronics Asia Pacific Pte., Ltd. | System and method for low power stereo perceptual audio coding using adaptive masking threshold |
US7610195B2 (en) * | 2006-06-01 | 2009-10-27 | Nokia Corporation | Decoding of predictively coded data using buffer adaptation |
JP5337235B2 (en) * | 2009-03-10 | 2013-11-06 | 日本電信電話株式会社 | Encoding method, decoding method, encoding device, decoding device, program, and recording medium |
CN103368682B (en) * | 2012-03-29 | 2016-12-07 | 华为技术有限公司 | Signal coding and the method and apparatus of decoding |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02131038A (en) * | 1988-11-10 | 1990-05-18 | Pioneer Electron Corp | Signal transmitter |
JP3343965B2 (en) * | 1992-10-31 | 2002-11-11 | ソニー株式会社 | Voice encoding method and decoding method |
US5774844A (en) * | 1993-11-09 | 1998-06-30 | Sony Corporation | Methods and apparatus for quantizing, encoding and decoding and recording media therefor |
US5684920A (en) * | 1994-03-17 | 1997-11-04 | Nippon Telegraph And Telephone | Acoustic signal transform coding method and decoding method having a high efficiency envelope flattening method therein |
DE19526366A1 (en) * | 1995-07-20 | 1997-01-23 | Bosch Gmbh Robert | Redundancy reduction method for coding multichannel signals and device for decoding redundancy-reduced multichannel signals |
GB2318029B (en) * | 1996-10-01 | 2000-11-08 | Nokia Mobile Phones Ltd | Audio coding method and apparatus |
-
1997
- 1997-02-07 FI FI970553A patent/FI970553A/en unknown
-
1998
- 1998-01-15 AU AU56648/98A patent/AU5664898A/en not_active Abandoned
- 1998-01-15 WO PCT/FI1998/000029 patent/WO1998035447A2/en active Application Filing
- 1998-02-05 DE DE1998104584 patent/DE19804584A1/en not_active Withdrawn
- 1998-02-05 JP JP2461598A patent/JPH10260699A/en not_active Withdrawn
- 1998-02-05 SE SE9800338A patent/SE9800338L/en not_active Application Discontinuation
- 1998-02-06 FR FR9801430A patent/FR2759510A1/en active Pending
- 1998-02-06 CN CN 98107058 patent/CN1202513C/en not_active Expired - Lifetime
- 1998-02-06 GB GB9802611A patent/GB2322776B/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
GB9802611D0 (en) | 1998-04-01 |
CN1202513C (en) | 2005-05-18 |
WO1998035447A2 (en) | 1998-08-13 |
FR2759510A1 (en) | 1998-08-14 |
FI970553A0 (en) | 1997-02-07 |
JPH10260699A (en) | 1998-09-29 |
CN1199959A (en) | 1998-11-25 |
GB2322776A (en) | 1998-09-02 |
SE9800338D0 (en) | 1998-02-05 |
AU5664898A (en) | 1998-08-26 |
GB2322776B (en) | 2002-03-13 |
WO1998035447A3 (en) | 1998-11-19 |
FI970553A (en) | 1998-08-08 |
DE19804584A1 (en) | 1998-08-13 |
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Legal Events
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NAV | Patent application has lapsed |